新安装或大修后的主变压器充电时，必须将重瓦斯保护改为（）位置

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问题单项选择题

A.跳闸

B.信号

C.停用

D.视情况而定

答案

参考答案：A

单项选择题

CT机采样系统的组成，不包括

A．扫描架

B．X线管

C．准直器

D．探测器

E．重建计算机

填空题

用所给动词的适当形式填空。

1. My mother began_____ (light) the fire to cook the breakfast.

2. Have you_____ (feed) the animals on the farm?

3. I am going to get my computer_____(repair) the day after tomorrow.

4. My uncle has_____(go) to Beijing and he will be back in two days,

5. Mr. Smith has to raise his voice so as to make himself_____ (hear) by all of us.